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在超高阴极中稳定介相,使高性能离子电池成为可能

Qing Zhao^1,2, Zhibin Zhang¹, Depeng Song¹

¹Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences, Qingdao 266101, China.

ACS applied materials & interfaces

|September 5, 2024

概括

用硫修改高阴极的表面,可以提高离子电池的性能. 这种简单的方法稳定了电极-电解质接口,提高了容量保留和电池寿命.

科学领域:

材料科学材料科学材料科学
电化学电化学电化学
储能储能储能储能储能储能

背景情况:

高 (Ni ≥90%) 阴极为下一代离子电池 (LIB) 提供高特异性容量.
阴极表面的剩余化合物导致高的界面反应性,限制了实际应用.
开发稳定的电极-电解质接口对于高阴极性能至关重要.

研究的目的:

通过解决接口反应性来提高高阴极的稳定性和性能.
为了研究 LiNi_0.9Co_0.06Mn_0.04O₂ (NCM90) 阴极的简单表面修饰方法.
为了改善使用NCM90阴极的LIBs的循环寿命和容量保留.

主要方法:

使用硫 (S) 的NCM90阴极材料的表面修改.
使用干燥混合和低温热处理工艺.
修改后的电极-电解质接口的表征和电化学性能评估.

主要成果:

表面残留化合物的转化为不活性硫酸盐 (Li2SO4).
形成一个稳定的,无机丰富的电极-电解质接口.
在长时间循环后,NCM90/Li和NCM90/石墨电池的容量保留显著增强.
抑制副作用反应,晶格崩和过渡金属离子溶解.

结论:

硫表面修改通过创建保护接口,有效地稳定高阴极.
开发的方法提供了一种可行的方法来提高下一代LIB的性能.
这项工作为设计高阴极材料的先进电极-电解质接口提供了新的策略.

关键词:

离子电池是一种离子电池.2SO4的使用情况:电极 - 电解质接口接口高阴极是高的阴极.界面反应性界面反应性表面的修改表面的修改

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